Great Planes Giant Aeromaster Kit - GPMA0502 - Manual (Page 22)

D D 5. Use a 3/32" x 3" x 24" balsa sheet to make the
center sheeting that fits between the LE sheet and the
TE sheet. Position the sheeting so that it is perpendicular
to the ribs. Before you glue the center sheeting in
position, remove the T-pins from ribs R-1T through R-5.
Note: The grain direction of the center sheeting should be
perpendicular to the ribs as shown.
D D 3. Use the holes in the cabane mounting plate as a
guide to drill a #10 (13/64") hole through the bottom
sheeting. To prevent the balsa sheeting from splitting,
place a wood block behind the sheeting while drilling
though it.
D D 6. From the 3/32" x 3/8" x 30" balsa sticks cut cap
strips, then use medium CA to glue them to the tops of the
ribs. Be sure to cut an opening for the strut slot in the cap
strip on rib R-PT.
D D 7. Remove the T-pins. Take the wing off your
building board. Carefully remove the jig tabs and use a
sanding bar with 150-grit sandpaper to sand the ribs flush
with the bottom main spar and aft balsa spar. Sand the TE
sheet, aft of the TE and the sub TE, to match the angle of
the ribs.
D D 4. Tap the holes with a 1/4-20 tap. Add a couple of
drops of thin CA to the holes to harden the threads. Then
retap the holes after the CA has fully cured.
D D 1. Use a razor saw and sanding bar to accurately cut
the spars, LE, TE and top sheet flush with rib R-1T.
D D 5. Fit a 3/32" x 3" x 36" balsa sheet to the top of the
wing panel by first sanding a bevel on the front edge of
the sheet so it matches the leading edge of the wing.
Also, sand the sub LE flush with the ribs. Install the top LE
sheet following the same procedure used to install the
bottom LE sheet.
D D 2. On rib R-1T use a straightedge to draw a line from
the front edge of the top main spar to the front edge of the
bottom main spar. Draw a line from the back edge of the
top main spar to the back edge of the bottom main spar.
Draw lines continuing the sides of the die-cut rectangle.
Use a razor saw to cut a slot in front and behind the
main spar.
D D 6. From the remaining 3/32" x 3" x 36" balsa sheet
used to sheet the bottom TE, sheet the top TE from rib
R-1T to R-5 following the same procedure.
D D 7. Glue a 3/32" x 3/8" x 30" balsa cap strip on the
top of rib R-6. The cap strip should be flush with the
outside of the rib. Use the leftover cap strip to sheet the
aft balsa spar from rib R-5 to R-6. The cap strip should be
flush with the front of the aft balsa spar.
D D 8. Use a 3/32" x 3" x 24" balsa sheet to make the
center sheeting between the LE and TE sheet on the top
of the wing.
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